Energetics
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What are: Exothermic reactions
Reactions which release heat to the surroundings
What are: Reactions that take in heat from the surroundings
endothermic
Practice and what is in a: Reaction profile
Chemical energy on y axis, Time on x axis, activation energy, a curve, energy of reactants and products, enthalphy change
What are examples of: Exo and endo thermic reactions
• Displacement, combustion, neutralisation • Thermal decomposition
What are uses of: Endo and exo thermic reactions
Exothermic: Hand warmers, self-heating cans Endothermic: cold packs
What is the equation for: Enery change
delta Q = mc delta T where m is mass of liquid, c is specific heat capacity and t is temperature change
What is the equation for: Enthalpy change
delta H = Q / mol unit: Kj/mol Symbol: + if endo - if exo
Why is: A bomb calirometer better than a normal calirometer
bomb calirometer has a large supply of oxygen, minimal heat loss to surroundings through insulation, food is set alight by wires, not a flame
How to do: Bond energy calculations
Breaking is endothermic Making is exothermic bendomexo, energy change = break - make